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Two techniques to sample non-volatiles in breath - Exemplified by methadone

Ljungkvist, Göran; Ullah, Shahid; Tinglev, Åsa; Stein, Karina; Bake, Björn; Larsson, Per; Almstrand, Ann Charlotte; Viklund, Emilia; Hammar, Oscar and Sandqvist, Sören, et al. (2018) In Journal of Breath Research 12(1).
Abstract

The particles in exhaled breath provide a promising matrix for the monitoring of pathological processes in the airways, and also allow exposure to exogenous compounds to be to assessed. The collection is easy to perform and is non-invasive. The aim of the present study is to assess if an exogenous compound - methadone - is distributed in the lining fluid of small airways, and to compare two methods for collecting methadone in particles in exhaled breath. Exhaled particles were collected from 13 subjects receiving methadone maintenance treatment. Two different sampling methods were applied: one based on electret filtration, potentially collecting exhaled particles of all sizes, and one based on impaction, collecting particles in the size... (More)

The particles in exhaled breath provide a promising matrix for the monitoring of pathological processes in the airways, and also allow exposure to exogenous compounds to be to assessed. The collection is easy to perform and is non-invasive. The aim of the present study is to assess if an exogenous compound - methadone - is distributed in the lining fluid of small airways, and to compare two methods for collecting methadone in particles in exhaled breath. Exhaled particles were collected from 13 subjects receiving methadone maintenance treatment. Two different sampling methods were applied: one based on electret filtration, potentially collecting exhaled particles of all sizes, and one based on impaction, collecting particles in the size range of 0.5-7 μm, known to reflect the respiratory tract lining fluid from the small airways. The collected samples were analyzed by liquid chromatography mass spectrometry, and the impact of different breathing patterns was also investigated. The potential contribution from the oral cavity was investigated by rinsing the mouth with a codeine solution, followed by codeine analysis of the collected exhaled particles by both sampling methods. The results showed that methadone was present in all samples using both methods, but when using the method based on impaction, the concentration of methadone in exhaled breath was less than 1% of the concentration collected by the method based on filtration. Optimizing the breathing pattern to retrieve particles from small airways did not increase the amount of exhaled methadone collected by the filtration method. The contamination from codeine present in the oral cavity was only detected in samples collected by the impaction method. We conclude that methadone is distributed in the respiratory tract lining fluid of small airways. The samples collected by the filtration method most likely contained a contribution from the upper airways/oral fluid in contrast to the impaction method.

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endogenous particles, exhaled breath, exogenous compounds, particle collection
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Journal of Breath Research
volume
12
issue
1
publisher
IOP Publishing
external identifiers
  • scopus:85040035294
ISSN
1752-7155
DOI
10.1088/1752-7163/aa8b25
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English
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no
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cdc8f1ff-013f-4b1c-9927-3b890adcfc7c
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2018-01-22 09:45:31
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2018-01-23 03:00:14
@article{cdc8f1ff-013f-4b1c-9927-3b890adcfc7c,
  abstract     = {<p>The particles in exhaled breath provide a promising matrix for the monitoring of pathological processes in the airways, and also allow exposure to exogenous compounds to be to assessed. The collection is easy to perform and is non-invasive. The aim of the present study is to assess if an exogenous compound - methadone - is distributed in the lining fluid of small airways, and to compare two methods for collecting methadone in particles in exhaled breath. Exhaled particles were collected from 13 subjects receiving methadone maintenance treatment. Two different sampling methods were applied: one based on electret filtration, potentially collecting exhaled particles of all sizes, and one based on impaction, collecting particles in the size range of 0.5-7 μm, known to reflect the respiratory tract lining fluid from the small airways. The collected samples were analyzed by liquid chromatography mass spectrometry, and the impact of different breathing patterns was also investigated. The potential contribution from the oral cavity was investigated by rinsing the mouth with a codeine solution, followed by codeine analysis of the collected exhaled particles by both sampling methods. The results showed that methadone was present in all samples using both methods, but when using the method based on impaction, the concentration of methadone in exhaled breath was less than 1% of the concentration collected by the method based on filtration. Optimizing the breathing pattern to retrieve particles from small airways did not increase the amount of exhaled methadone collected by the filtration method. The contamination from codeine present in the oral cavity was only detected in samples collected by the impaction method. We conclude that methadone is distributed in the respiratory tract lining fluid of small airways. The samples collected by the filtration method most likely contained a contribution from the upper airways/oral fluid in contrast to the impaction method.</p>},
  articleno    = {016011},
  author       = {Ljungkvist, Göran and Ullah, Shahid and Tinglev, Åsa and Stein, Karina and Bake, Björn and Larsson, Per and Almstrand, Ann Charlotte and Viklund, Emilia and Hammar, Oscar and Sandqvist, Sören and Beck, Olof and Olin, Anna Carin},
  issn         = {1752-7155},
  keyword      = {endogenous particles,exhaled breath,exogenous compounds,particle collection},
  language     = {eng},
  number       = {1},
  publisher    = {IOP Publishing},
  series       = {Journal of Breath Research},
  title        = {Two techniques to sample non-volatiles in breath - Exemplified by methadone},
  url          = {http://dx.doi.org/10.1088/1752-7163/aa8b25},
  volume       = {12},
  year         = {2018},
}